Rock Krawler Suspension's 1.5 and 2.5 Stock Mod Systems are a high value entry level kit. Stock Mod Systems provide you the ability to upgrade in the future or replace an underperforming linear coil spring system. All Stock Mod Systems include tuned triple rate coil springs for the ultimate in ride quality and assured lift heights. Double Adjustable bomb proof front track bars are included in all stock mod kits. This track bar allows you to center the front axle under the vehicle to ensure the vehicle is tracking properly. Also included is a rear track bar bracket that is produced from a rigid laser cut plate steel. This bracket perfectly centers the rear axle while improving the rear roll center. Rock Krawler's Stock Mod kits are the highest value systems on the market today for Wrangler owners wanting to run 33-35 tires.